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1. 发明授权

US4074087A Bidirectional voice frequency repeater 失效
标题翻译：双向语音中继器
公开(公告)号：US4074087A
公开(公告)日：1978-02-14
申请号：US714306
申请日：1976-08-16
申请人： Roy B. Blake, Jr. , James d. Gwatkin, III , Judy P. Magee , Glendon R. Porter
发明人： Roy B. Blake, Jr. , James d. Gwatkin, III , Judy P. Magee , Glendon R. Porter
IPC分类号： H03F3/62 , H03H11/36 , H04B1/58 , H04B3/03 , H04B3/20 , H04B3/36
CPC分类号： H04B1/586 , H04B1/581
摘要： Hybridless bidirectional transmission networks typically include telephone line coupling transformers and unidirectional amplifiers for enhancing outgoing and incoming signals. Unwanted signal components in the outgoing direction, caused by cross coupling via the transformer of incoming signals, are minimized by employing a canceller network in circuit with the incoming and outgoing amplifiers. The canceller network has a complex transfer characteristic to compensate substantially for complex impedance components of the coupling transformer and 2-wire transmission facility and to generate a signal which is substantially a replica of the unwanted outgoing signal components. The replica signal and unwanted signal components are algebraically combined in the outgoing amplifier effectively to eliminate the unwanted signal components from the outgoing path. In a first embodiment the canceller network has an attenuation versus frequency characteristic yielding a prescribed second-order complex transfer characteristic while in a second embodiment the canceller network has an attenuation versus frequency characteristic yielding a prescribed fourth-order complex transfer characteristic. In the second embodiment values of predetermined pole-zero pairs are selectively adjustable to match impedance components of different 2-wire transmission facilities.
摘要翻译：无混合双向传输网络通常包括用于增强输出和输入信号的电话线耦合变压器和单向放大器。通过使用输入和输出放大器的电路中的消除网络，在输出方向上的不需要的信号分量通过输入信号的变压器的交叉耦合引起的最小化。消除器网络具有复杂的传输特性，用于基本上补偿耦合变压器和2线传输设施的复杂阻抗分量，并产生基本上是不需要的输出信号分量的复制品的信号。复制信号和不需要的信号分量有效地代表性地组合在输出放大器中，以消除来自输出路径的不需要的信号分量。在第一实施例中，消除器网络具有产生规定的二阶复数传递特性的衰减对频率特性，而在第二实施例中，消除器网络具有产生规定的四阶复数传递特性的衰减对频率特性。在第二实施例中，预定极 - 零对的值可选择性地可调，以匹配不同2线传输设施的阻抗分量。

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